Book: Wilkinson, Vega. 2002 Spode-Copeland-Spode: The Works and its People 1770- 1970.
• Lists date for patterns 3000- 3500 as 1821: p. 282, marks with dates: pp. 280- 81Book: Copeland, Robert. 1999 Spode's Willow Pattern and other Designs after the Chinese.
• This (pattern 3144) and the same pattern in blue and red (pattern 2086) on Spode ironstone plates: col. pl. 6